Choke controller



Sept. 1, 1925.

F. A. BRAGG CHOKE CONTROLLER Filed- Feb. 13, 1925 Patented Sept. 1, 1925.

FRANqs A. BRAQQ; i0? QFDXBQBQ, ASSMFUSETeTd I cHoKn eoi IT poIiLnn,

An li ii l as s r m 13, 1 2, we? re 29.21

7 '0 all whom it may concern:

Be it known th t I, F nn yors BB QG a citizen of the United States, residing'at Fojxl- V boro, in the county of l\ ort olk Massachusetts, have invented certain new and useful Improvements in Choke Con trollers, of which the i'pllowing a speci;

fication', i

The present invention relates to internal combustion engines, and more 'partic ularl,y

to choke controls thereforjwhich are used principally in connection With the fi pz l" to provide the carbureter with a mix- I ture until the motor becomes warm enough to operate with the lean mixturewhich the carbureter is adjusted to provide undernorvmal operating conditions. In Winter weather when the cold varies in intensity irom day to day it is hi -hly'desirable to operate the carbureter with a Xture which varies in richness inversely with the fall in .te1nperature. To do this at the present time would require continuous tampering with thecarbureter adjustment which is impracticable.

The object :01 the present invention is to produce a choke control which, in addition to providing the carhureterwith an operat: 1ing mixture which is leaner than the starting mixture but richer than the mixture which the carbureter is adjusted to provide.

To the accomplishment of this object, and such others as may hereinatter appear, the features of the invention relate to certain devices, combinations, and arrangements ,of

parts, hereinafter described and "then set forth broadly and in detail in the appended claims which possess advantages readily ap parent to those skilled in theart.

The various features of the present inven tion will be best understood from inspection of the accompanying drawings illustrating the best form of the invention at present devised, in which,

F'g'ure 1 is a right slde'elevation of the choke control, the dash, cowl and instrument board being shown in section, and

Fig. 2 is an enlarged detail in right side r elevation showing an exaggerated arrange Specifically the prese'nt inventi'oh.

* u NITED i me t'ofthe adjusting'screw" with relation 2 I to t e hek Lied arid* est sin n rd Referring to the drawing the carhureter 3 p n carers 4' i h S tfl by a choke valve (not shown) havingfiiied thereto an operating arm "51 'Thechoker valve is normally held ina non-,chol ;ing po sition coiled spring 6,fl1,aving a'fiXed anchorage 7. The am 5 is operated the te ses of thespsng ,eby ree s from one arm of bell. cranklever servers-a 611" a .brfacketflo carried the dash 11." :The other arm of the bell crank lever 9 is en ga'ged by a choke rod 12", eigtending tinge nall'y upward through the instrument board 13 terminating. .on the cab side er the The choke rod '12 is pno-videdwithia head or button 14 at: its free end somet ings hand" iece by wli iclitheichoke its ay-b pulled to move the choke ivi alve into choking posio ae n' th fiee ie fef fl rri s With hi icqn tet t 'vlii' i$' the lev equipment of a Ford"'1no-tor',the'choke rod occupies either a ri'ormal inactive positionin which the choke valve is open to permit la free flow of air in the pipe d or a tempo-rary rting .pp t nsin'hu ha e. t ee valve is closed or partially closedtochoke'theiair in the pipe fl and thus 'pr'oviddthe tarts reterwith a rich miitt'ureto facilitate starts cq d'inbtororder toprovide an intermediate .operating pos tion for'the choke rod in which the choke ival ve is slightly closed toprovide the carhureter with a mixture leaner than the mixtii re 'ldu t richer than the mixture forwhjich the carbureter is adjusted the button 1 1 is to receive the threads provided with a knurled head 16 by which the screw may be adjusted relatively to the button The'other end of the screw 15 is arranged to engage the instrument board fare thus ete Steri bpre n h rern of th h 'k rred' am i tempe e y' starting position to its normal inactive .po- 7 sition when theoperator, after the motor is warmed up, releases the choke rod gas the influence of the spring 6. The screw 15 is" locked in any desired position of adjust control 'has lbeen pulled out to vprovide 1a ,105 ment by a set' nu't gnounted on the screw 15 atr needtp sens e l t on 4:- I

With this co nstruction, after )the" choke i e an-i ls i ter it n bs 51 ei P 1 5 1 tion, an instrument board, a choke rodv hav instantly to the position determined by the stop screw 15. By backing off the nut 17 and rotating the screw 15 within the button l4 and resetting the set nut 17 very fine adjustments can be secured to obtain an operating mixture to suit any atmospheric condition. If, after operating the motor with the choke rod in its intermediate operating position, it should be desired to operate with the lean mixture which the carbureter is adjusted to provide the screw 15 may be with drawn from the instrument board by backing it off withinthe button 14: thus restoring the choke rod to the influence of the spring 6 (Fig. 1). V i

It will be apparent to those skilled in the art that the features of my invention may' be incorporated in a Ford motor car in an exceedingly simple manner. As the only change required is in the button ll which projects beyond the cab side of the. instrument board no work of any kind is required on the instrument board. The change from the old to the new control may be made without the assistance of a skilled mechanic. All that is required is to disconnect the usual choke rod from the bell cranklever 9 and substitute a new choke rod having the screw 15 threaded through the button 14 together with the set nut 17. The old choke rod may then be used in another car after it is provided with a stop screw 15. and a set nut 17, which is an easy and cheap operation. I v

The nature and scope of the invention having been indicated, and its preferred embodiment having been specifically described, what is claimed as new, is c l l. A choke control having, in combina tion, a choke rod extending through an instrument board having a normal inactive position and movable by the operator into a temporary starting position, and means mounted entirely on that portion of the choke rod that extends beyond the cab sidev of the instrument board for preventing the choke rod from returning to its normal inactive position when released by the operator.

2. A choke control having, in combination, a choke rod having a normal inactive position and a temporary starting position, and means mounted upon and movable relatively to and longitudinally of the choke rod for determining an intermediate operating position. 7

3. A choke control having,'in combination, a choke rod having a normal inactive position, a temporary starting position and 7 an intermediate operating position, .and a screw carried by the choke rod for determining its intermediate operating position. 4. A choke control having, in combinaing a normal inactive position and movable ment board to vary by the operator into a temporary starting position, and a screw interposed between the choke rod and the instrument board for preventing the choke rod returning from its temporary starting position to its normal inactive position when released by the operator.

5. A choke control having, in combination, a choke rod having a normal inactive position and a temporary starting position, and an adjustable stop member for, determining an intermediate operating position, said stop and choke rod being relatively adjustable from the, cab side of'the instrusaid intermediate position at the will of the operator.

6. A choke control having, in combination, an instrument board, a choke rod having an operating button thereon, said choke rod having a normal inactive position, a temporary starting position, and an intermediate operating position, and a screw rotatablyrmounted on said button and arranged to engage the instrument board for determining the intermediate operating position of the choke rod.

7. A choke control having, in combination, an instrument board, a choke rod having an operating button thereon, said choke rod having a normal inactive position, a temporary starting position, and an intermediate operating position, a screw threaded through said button and, adjustable to engage the instrument board for determining the intermediate operating position of the choke rod, and a set nut carried by the screw and arranged to engage the button for locking the screw in any desired position of adjustment.

8. A choke control comprising a choke rod adapted to be connected to the operating mechanism of the choke valve of a carbureter, and an adjustable stop member carried by its end under control of the operator and mounted for movement relatively to and longitudinally of the rod.

9. A choke control comprising a choke rod adapted to be connected to the operating mechanism of the choke valve of a carbureter, an adjustable stop member carried by its end under control of the operator and mounted for movement relatively to and longitudinally of the rod, and means for retaining said stop member in any desired position of adjustment.

10. A choke control comprising a choke. rod adapted to be connected to the operating mechanism of the choke valve of a carbureter, having an operating button, said button having a hole the axis of Which is substantially parallel to the axis of the rod,

and a stop member adjustably seated in said hole and movable therethrough to different positions relative to'the end of the rod. 7

FRANCIS A. BRAGG. 

